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Security audit

Stay AI

Security checks for vulnerabilities and agentic risk

Overview

The Stay AI reading workflow fits its purpose, but automatic setup executes unchecked remote code and leaves broader local changes unclear.

Review setup before installing: use a verified CLI release and approve its local changes, including any automatic installation of other agent skills. Connect only the needed Stay AI account and permissions, understanding that requests pass through OOMOL. The remote installer and server-side credential handling remain unverified; no malicious behavior was established.

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
97% confidence
Finding

The supplied code performs a remote installer execution rather than searching or reading Stay AI data. No connection between the Oomol installer and the declared functionality is established in the supplied content, so this cannot be treated as a demonstrated supporting implementation detail. The downloaded script's further actions are not visible.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a remotely fetched, unpinned script directly into Bash without an independent integrity check; the PowerShell alternative uses the same download-and-execute pattern. If the distribution endpoint or release pipeline is compromised, attacker-controlled code could execute with the agent's local privileges, exposing accessible files and credentials despite Stay AI credentials being injected server-side.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning the user about remote code execution or local system changes.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

When the CLI is missing, the skill directs the agent to execute a remote installer without requiring approval for arbitrary code execution or local software changes. Limiting this behavior to first-time setup reduces exposure, but a request to read Stay AI data does not itself authorize installing software with the agent's local privileges.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 79)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources